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"Computer Systems: A Programmer's Perspective" is a great introductory systems textbook on everything going on in a computer.

For more advanced C/C++ developers I can recommend "The Linux Programming Interface" - (https://man7.org/tlpi/). It is a GREAT compendium for writing code against the POSIX API. I have a (legal) copy of this book on all the computers I have access to.

"The Database Redbook" - (http://www.redbook.io) is a valuable source on database implementations.

"Compilers: Principles, Techniques, and Tools" (Dragon Book) is a great starting point. The book is out of print and but I think it should still hold up for most basic use-cases.